Bollard manufacturing method

Abstract

To provide a bollard which is easily reduced in weight and efficiently manufactured while having a structure in which an outer peripheral part of a support is covered with rubber.SOLUTION: The bollard is manufactured through a cushion material covering step of covering an outer periphery of a support 30 with a cushion material 20 made of a foamed resin, a tube extrapolation step of extrapolating a rubber-based heat-shrinkable tube 40 having an inner diameter D2 larger than an outer diameter D1 of the cushion material 20 to the cushion material 20, and a tube shrinking step of heating and shrinking the heat shrinkable tube 40 to bring an inner peripheral surface of the heat shrinkable tube 40 into close contact with an outer peripheral surface of the cushion material 20.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a bollard.

Background Art

[0002] Conventionally, as a bollard, there is known one that elastically bends from the base when a vehicle such as an automobile collides (elastic bollard) (see, for example, Patent Document 1). In this elastic bollard, even if a vehicle, a person, or the like collides with it, the impact received by the vehicle, the person, or the like can be reduced. However, in recent years, accidents in which a car attempting to park in a parking lot collides violently with a building due to a mistake in stepping on the brake and accelerator have been frequently reported. As a bollard installed at the boundary between a parking lot and a building, if an elastic bollard is adopted, it is impossible to prevent the car from colliding violently with the building. For this reason, at locations where there is a risk of a car colliding, metal bollards having a rigidity such that they do not easily bend even when a car collides are being reexamined. However, if the entire bollard is hard, the vehicle body will be damaged when the car collides. Therefore, as shown in FIG. 1 of the present application, a bollard in which the outer peripheral portion of a hard column 30 is covered with a rubber cushioning material 20 has been constructed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the case of a bollard with a rubber cushioning material 20 attached to the outer peripheral portion of the support column 30, if the buffering performance is to be increased, it is necessary to thicken the rubber portion (cushioning material 20). However, when the rubber portion is thickened, the weight of the bollard increases, and the workability of construction deteriorates. In addition, since the vulcanization time of the rubber becomes longer, the manufacturing efficiency of the bollard decreases, and the manufacturing cost increases.

[0005] The present invention has been made to solve the above problems, and provides a bollard that has a structure in which the outer peripheral portion of the support column is covered with rubber, is easy to reduce in weight, and is also easy to manufacture efficiently.

Means for Solving the Problems

[0006] The above problems are a cushioning material covering step of covering the outer peripheral portion of the support column with a cushioning material made of a foamed resin, a tube insertion step of inserting a rubber-based (including not only rubber but also elastomers such as polyolefin-based elastomers) heat-shrinkable tube having an inner diameter D2 larger than the outer diameter D1 of the cushioning material over the cushioning material, a tube shrinking step of heating and shrinking the heat-shrinkable tube to bring the inner peripheral surface of the heat-shrinkable tube into close contact with the outer peripheral surface of the cushioning material characterized by passing through and is solved by providing

[0007] In the bollard manufactured by the above manufacturing method, the cushioning material is formed of a foamed resin having a specific gravity smaller than that of rubber. Therefore, the bollard can be made lightweight and easy to transport and construct. Further, since the outer surface of the cushioning material made of foamed resin is covered with a rubber layer (rubber-based heat-shrinkable tube), the cushioning material can be protected by the rubber layer, and the durability of the cushioning material can be enhanced. Furthermore, since a rubber-based heat-shrinkable tube having an inner diameter larger than the outer diameter of the cushioning material is externally inserted into the cushioning material and heat-shrunk, the heat-shrinkable tube is integrated with the cushioning material. Therefore, in the process of integrating the rubber layer with the cushioning material, there is no need to vulcanize the rubber. In addition, the operation of externally inserting the heat-shrinkable tube into the cushioning material can be easily performed. Therefore, the bollard can also be efficiently manufactured in a short time.

[0008] In the method for manufacturing a bollard of the present invention, the inner diameter D2 of the heat-shrinkable tube before heat shrinkage is not particularly limited as long as it is larger than the outer diameter D1 of the cushioning material. However, if the inner diameter D2 is only slightly larger than the outer diameter D1, it may be difficult to externally insert the heat-shrinkable tube into the cushioning material (insert the cushioning material into the heat-shrinkable tube). Therefore, the ratio D2 / D1 of the inner diameter D2 of the heat-shrinkable tube before shrinkage to the outer diameter D1 of the cushioning material is preferably 1.05 or more. However, if the inner diameter D2 is made too large with respect to the outer diameter D1, even when the heat-shrinkable tube is heat-shrunk, the entire inner peripheral portion of the heat-shrinkable tube may not adhere closely to the outer peripheral portion of the cushioning material. In addition, there is also a possibility that wrinkles may occur in the heat-shrinkable tube after heat shrinkage. Therefore, the ratio D2 / D1 of the inner diameter D2 of the heat-shrinkable tube before shrinkage to the outer diameter D1 of the cushioning material is preferably 2 or less.

[0009] By the way, simply covering the outer peripheral surface of the cushioning material with a tubular heat-shrinkable tube cannot cover the upper end portion of the cushioning material. For this reason, there is a risk that rainwater or the like may seep in from the upper end portion of the cushioning material, causing the cushioning material to deteriorate. This seepage of rainwater or the like can be prevented by covering the upper end portion of the cushioning material with a cap. However, it is not always easy to attach the cap without forming a gap with the cushioning material. This is because when performing the tube insertion process, the heat-shrinkable tube is usually arranged even in the range protruding above the cushioning material so that the entire outer peripheral surface of the cushioning material can be surely covered with the heat-shrinkable tube. Therefore, when attaching the cap, the portion protruding above it gets in the way. This problem can be solved, for example, by adopting the following configuration.

[0010] That is, the above problem can be solved by after performing the tube shrinking process, a tube upper cutting process of cutting the portion of the heat-shrinkable tube protruding upward from the upper end portion of the cushioning material, and a cap attaching process of attaching the cap to the upper end portion of the cushioning material being performed.

[0011] In this case, after performing the cap attaching process, it is preferable to perform a tape attaching process of annularly attaching a covering tape along the upper edge of the heat-shrinkable tube. When performing the tube upper cutting process, there is a risk that irregularities may be formed on the cut surface of the tube. By covering that portion with the covering tape, the irregularities can be hidden and the appearance of the bollard can be improved. The covering tape can also be one provided with a reflective layer made of a retroreflective material on its outer surface (reflective tape). Thereby, the headlight of a vehicle or the like can be reflected by the covering tape (reflective tape), and the visibility of the bollard at night can be enhanced.

[0012] In addition, the above problem can also be solved by performing a jig installation step of installing a jig having the same outer diameter as the cushioning material at the upper end of the cushioning material before performing the tube shrinkage step, and after performing the tube shrinkage step, performing a jig removal step of removing the jig from the upper end of the cushioning material and a cap attachment step of attaching a cap to the upper end of the cushioning material.

[0013] The size of the above cap is appropriately determined according to the form required for the bollard.

[0014] The seepage of rainwater or the like described above can occur not only at the upper end of the cushioning material but also at the lower end. Therefore, it is preferable to prevent water leakage also on the lower end side of the cushioning material. The lower end side of the cushioning material can be waterproofed, for example, by adopting the following configuration.

[0015] That is, when performing the tube insertion step, the heat-shrinkable tube is also arranged in a range protruding downward from the lower end of the cushioning material, and before performing the tube shrinkage step, a waterproofing material installation step of covering the lower end surface of the cushioning material with a waterproofing material is performed. After performing the tube shrinkage step, a tube lower side cutting step of cutting the portion of the heat-shrinkable tube protruding downward from the lower end of the waterproofing material can waterproof the lower end side of the cushioning material.

[0016] In addition, when performing the tube insertion step, the heat-shrinkable tube is also arranged in a range protruding downward from the lower end of the cushioning material and reaching the lower end of the support column, and after performing the tube shrinkage step, the portion of the heat-shrinkable tube protruding downward from the lower end of the cushioning material is brought into close contact with the outer peripheral portion of the support column, whereby the lower end side of the cushioning material can also be waterproofed. This eliminates the need to use a waterproofing material. It is also possible to prevent corrosion of the support column and increase the rigidity of the support column.

[0017] By the way, among the above problems, regarding the weight reduction, a cushioning material covering step of covering the outer peripheral portion of the support column with a cushioning material made of foamed rubber, A tube insertion step of inserting a rubber-based heat-shrinkable tube having an inner diameter D2 larger than the outer diameter D1 of the cushioning material over the cushioning material, a tube shrinking step of heating and shrinking the heat-shrinkable tube to bring the inner peripheral surface of the heat-shrinkable tube into close contact with the outer peripheral surface of the cushioning material, characterized by passing through a method for manufacturing a bollard is also solved by providing.

[0018] In the bollard manufactured by the above manufacturing method, the cushioning material is formed of foamed rubber having voids. For this reason, the bollard can be lightened, and the transportation and construction of the bollard are facilitated. Further, the durability and heat resistance of the bollard can be enhanced. Furthermore, if pre-vulcanized foamed rubber is used as the cushioning material, the time required for vulcanization can be omitted, so that the manufacturing efficiency of the bollard can be enhanced.

Effect of the Invention

[0019] As described above, according to the present invention, it is possible to provide a bollard that is easy to lighten and can be efficiently manufactured while having a structure in which the outer peripheral portion of the support column is covered with rubber.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

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Figure 7

Figure 8

Figure 9

Figure 10

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Figure 12

Figure 13

Mode for Carrying Out the Invention

[0021] The manufacturing method of the bollard of the present invention will be described more specifically with reference to the drawings. In the following, taking the bollards of six embodiments from the first embodiment to the sixth embodiment as examples, the manufacturing method of the bollard of the present invention will be described. However, these embodiments are merely preferred embodiments, and the technical scope of the present invention is not limited to the configurations described below. The manufacturing method of the bollard of the present invention can be appropriately modified within a range that does not impair the gist of the invention.

[0022] 1. Bollard of the first embodiment 1.1 Outline of the bollard of the first embodiment First, the outline of the bollard of the first embodiment will be described. FIG. 2 is a cross-sectional perspective view showing the bollard 10 of the first embodiment. As shown in FIG. 2, the bollard 10 of the first embodiment includes a support column 30, a cushioning material 20, a heat-shrinkable tube 40, a covering tape 54, a water-stop material 60, and a cap 50.

[0023] The cushioning material 20 is provided in a state of covering the outer peripheral portion of the upper section of the support column 30. This cushioning material 20 is formed of a foamed resin. The heat-shrinkable tube 40 is provided in a state of covering the outer surfaces (outer peripheral surfaces) of the cushioning material 20 and the water-stop material 60. This heat-shrinkable tube 40 is formed of a rubber-based heat-shrinkable material. The covering tape 54 is annularly attached along the upper edge of the heat-shrinkable tube 40 from the outside of the heat-shrinkable tube 40. The water-stop material 60 is provided in a state of covering the lower end surface of the cushioning material 20. As will be described later, in the bollard 10 of the first embodiment, a rubber-made annular member (rubber ring) is used as the water-stop material 60. The cap 50 is provided so as to cover the upper end surface of the cushioning material 20.

[0024] In this way, by forming the cushioning material 20 of a foamed resin, the bollard 10 is lightened, and it becomes possible to easily carry and construct the bollard 10. Further, although it is hard to say that the foamed resin forming the cushioning material 20 is excellent in durability and stain resistance, by covering the outer surface of the cushioning material 20 with the rubber-based heat-shrinkable tube 40, the cushioning material 20 is protected by the heat-shrinkable tube 40, and the durability and stain resistance of the bollard 10 have been successfully improved.

[0025] The bollard 10 of the first embodiment is usually constructed to be perpendicular to the construction surface (such as a road surface or the ground). Thereby, the bollard 10 can function as a vehicle stopper or the like. The bollard 10 of the first embodiment can be constructed by excavating a hole in the construction surface, laying broken stones at the bottom of the hole, inserting the lower end of the support column 30 into the hole, and then filling the hole with mortar or the like and curing it. However, this construction is only an example. The specific construction method is appropriately determined according to the state of the construction surface and the like.

[0026] 1.2 Manufacturing method of the bollard of the first embodiment As shown in FIG. 3, the bollard 10 of the first embodiment is manufactured by covering the outer peripheral portion of the support column 30 with a cushion material 20 (cushion material covering step), inserting a heat shrinkable tube 40 over the cushion material 20 as shown in FIGS. 4 and 5 (tube insertion step), and shrinking the heat shrinkable tube 40 as shown in FIGS. 6 and 7 (tube shrinking step). After that, a step of cutting the upper side of the heat shrinkable tube 40 (tube upper side cutting step), a step of cutting the lower side of the heat shrinkable tube 40 (tube lower side cutting step), and a step of attaching a cap 50 (cap attaching step) are performed. Before performing the tube shrinking step, a step of disposing a water stop material 60 at the lower end of the cushion material 20 (water stop material installation step) is performed.

[0027] FIGS. 3 to 7 are diagrams showing the state of manufacturing the bollard 10 of the first embodiment. FIG. 3 is a perspective view showing the state after the cushion material covering step. FIG. 4 is a perspective view showing the state of performing the tube insertion step, and FIG. 5 is a cross-sectional view (cross-sectional view cut along a plane including the center line L) showing the state after the tube insertion step. FIG. 6 is a cross-sectional view (cross-sectional view cut along a plane perpendicular to the center line L) showing the state of performing the tube shrinking step. FIG. 6(a) shows the state before performing the tube shrinking step, and FIG. 6(b) shows the state after the tube shrinking step. FIG. 7 is a cross-sectional view (cross-sectional view cut along a plane including the center line L) showing the state after the tube shrinking step.

[0028] The following describes these processes.

[0029] (1) Cushion material covering process The cushion material covering process (Fig. 3) is a process of covering the outer peripheral portion of the support column 30 with the cushion material 20. In the bollard 10 of the first embodiment, as will be described later, since the cushion material 20 is constituted by one cylindrical member, the support column 30 is inserted into the through hole provided in the cushion material 20, thereby performing the cushion material covering process. When performing this cushion material covering process, an adhesive or the like may be applied to the outer peripheral surface of the support column 30 or the inner peripheral surface of the cushion material 20. Thereby, the cushion material 20 can be firmly adhered to the support column 30, making it difficult for the cushion material 20 to come off from the support column 30.

[0030] (2) Tube outer insertion process The tube outer insertion process (Figs. 4 and 5) is a process of externally inserting the heat shrinkable tube 40 onto the cushion material 20 (a process of inserting the cushion material 20 inside the heat shrinkable tube 40). Since the inner diameter D2 (Fig. 6(a)) of the heat shrinkable tube 40 is larger than the outer diameter D1 (Fig. 6(a)) of the cushion material, the cushion material 20 can be easily inserted inside the heat shrinkable tube 40. This tube outer insertion process is performed after the above-described cushion material covering process. Similar to when performing the cushion material covering process, an adhesive can also be used when performing this tube outer insertion process. That is, an adhesive can also be applied to the outer peripheral surface of the cushion material 20 or the inner peripheral surface of the heat shrinkable tube 40. However, the heat shrinkable tube 40 is shrunk in the tube shrinking process (Figs. 6 and 7). After performing the tube shrinking process, the inner peripheral surface of the heat shrinkable tube 40 is in close contact with the outer peripheral surface of the cushion material 20 (a state where the cushion material 20 is tightened by the heat shrinkable tube 40), and the heat shrinkable tube 40 becomes difficult to move with respect to the cushion material 20. For this reason, the necessity of using an adhesive in the tube outer insertion process is lower than that in the cushion material covering process.

[0031] (3) Waterstop material installation process The waterstop material installation process is a process of arranging the waterstop material 60 at the lower end of the cushion material 20. When using a rubber ring or the like (a member with a definite shape) as the waterstop material 60 as in the bollard 10 of the first embodiment, this waterstop material installation process is carried out before the tube shrinkage process. Specifically, the waterstop material installation process is carried out immediately after the cushion material coating process or immediately after the tube insertion process. After the tube shrinkage process is carried out to shrink the heat shrinkable tube 40, the heat shrinkable tube 40 becomes an obstacle and it becomes difficult to install the waterstop material 60. This is not the case when using a sealing material or the like (such as silicone, a material whose shape is not determined until it hardens) as the waterstop material 60.

[0032] (4) Tube shrinkage process The tube shrinkage process (Figs. 6 and 7) is a process of shrinking the heat shrinkable tube 40. This tube shrinkage process is carried out after the above tube insertion process. The shrinkage (heat shrinkage) of the heat shrinkable tube 40 is carried out by heating the heat shrinkable tube 40. The heating of the heat shrinkable tube 40 can be carried out using heating means such as a heater or a dryer. Thereby, as shown in Fig. 6(a), the heat shrinkable tube 40 having an inner diameter D2 larger than the outer diameter D1 of the cushion material 20 is heat shrunk, and as shown in Fig. 6(b), the inner peripheral surface of the heat shrinkable tube 40 is in a state of being in close contact with the outer peripheral surface of the cushion material 20. The thickness of the heat shrinkable tube 40 after heat shrinkage (Fig. 6(b)) becomes larger than the thickness of the heat shrinkable tube 40 before heat shrinkage (Fig. 6(a)).

[0033] The heating temperature of the heat-shrinkable tube 40 is appropriately determined according to the materials of the heat-shrinkable tube 40 and the cushioning material 20. Specifically, the heat-shrinkable tube 40 is heated at a temperature higher than the shrinkage temperature of the heat-shrinkable tube 40 and lower than the melting point of the foamed resin forming the cushioning material 20. For this reason, a foamed resin of the cushioning material 20 having a melting point higher than the shrinkage temperature of the heat-shrinkable tube 40 is selected. In the bollard 10 of the first embodiment, as will be described later, an ethylene propylene rubber (EPM)-based heat-shrinkable tube 40 (shrinkage temperature: 80 to 105°C) is used, and the cushioning material 20 is formed of a foamed resin of polypropylene (PP) (melting point: 145°C). Here, the tube shrinkage step is performed by heating the heat-shrinkable tube 40 at about 120°C. In this way, by heating the heat-shrinkable tube 40 at a temperature higher than its shrinkage temperature, it can be shrunk in a relatively short time of 10 to 20 minutes.

[0034] The ratio D2 / D1 of the inner diameter D2 (Fig. 6(a)) of the heat-shrinkable tube 40 before the tube shrinkage step to the outer diameter D1 (Fig. 6(a)) of the cushioning material 20 is not particularly limited as long as it is greater than 1. However, if the ratio D2 / D1 is too small (too close to 1), it may be difficult to externally insert the heat-shrinkable tube 40 into the cushioning material 20 in the tube external insertion step. For this reason, the ratio D2 / D1 is preferably 1.05 or more. The ratio D2 / D1 is preferably 1.1 or more, and more preferably 1.2 or more. However, if the ratio D2 / D1 is too large, the inner peripheral surface of the heat-shrinkable tube 40 may not adhere to the outer peripheral surface of the cushioning material 20 even when the heat-shrinkable tube 40 is heated in the tube shrinkage step. For this reason, the ratio D2 / D1 is preferably 2 or less. The ratio D2 / D1 is more preferably 1.8 or less, and even more preferably 1.5 or less. In the bollard of the present embodiment, the ratio D2 / D1 is 1.5.

[0035] After the tube shrinking process, a process of applying a paint or the like (paint application process) can be performed on the outer surface of the heat shrinkable tube 40. Thereby, the durability and waterproofness of the bollard 10 can be further enhanced. Since the heat shrinkable tube 40 has a smoother surface than the cushioning material 20, the paint can be applied neatly and delicately on the surface of the heat shrinkable tube 40. Therefore, the appearance of the bollard 10 can also be improved.

[0036] (5) Upper tube cutting process The upper tube cutting process is a process of cutting the heat shrinkable tube 40 protruding upward from the upper end surface of the cushioning material 20. Specifically, using a cutting means such as a cutter, the portion (a) (FIG. 7) of the heat shrinkable tube 40 is cut. If the portion (a) remains, when performing the later cap mounting process, the portion (a) becomes an obstacle and it becomes difficult to mount the cap 50 on the upper side of the cushioning material 20 and the support column 30. By cutting this portion (a), not only does it become easier to mount the cap 50, but also the lower end surface of the cap 50 can be made to be in close contact with the upper end surface of the cushioning material 20, and a gap can be prevented from being formed between the lower end surface of the cap 50 and the upper end surface of the cushioning material 20. For this reason, a gap through which rainwater or the like can enter is not formed in the bollard 10, and the support column 30 can be made less likely to corrode. This upper tube cutting process is performed after the above-described tube shrinking process.

[0037] (6) Lower tube cutting process The lower tube cutting process is a process of cutting the heat shrinkable tube 40 protruding downward from the lower end of the water stop material 60. Specifically, using a cutting means such as a cutter, the portion (b) (Fig. 7) of the heat shrinkable tube 40 is cut. If the portion (b) remains, the appearance of the bollard 10 will be deteriorated. By cutting the portion (b), the appearance of the bollard 10 can be improved. When the portion (b) is cut, the lower end surface of the cushion material 20 will no longer be covered by the heat shrinkable tube 40. However, in the bollard 10 of the first embodiment, since the water stop material 60 is provided, there is no particular problem. This lower tube cutting process is also performed after the above-described tube shrinking process. The lower tube cutting process may be performed after the upper tube cutting process or before the upper tube cutting process.

[0038] (7) Cap mounting process The cap mounting process is a process of mounting the cap 50 on the upper end surface of the cushion material 20. Thereby, rainwater or the like can be prevented from hitting the upper end surface of the cushion material 20. If a cap 50 incorporating a light source such as a light emitting diode (LED) or a power source for lighting it is used, the visibility of the bollard 10 at night can be further enhanced. In this way, by incorporating electronic components or the like in the cap 50, the bollard 10 can be made more highly functional. This cap mounting process is performed after the upper tube cutting process. When the cap mounting process is completed, the bollard 10 is completed.

[0039] (8) Parentheses As described above, by performing the tube contraction process, the tube extrapolation process can be performed with the inner diameter D2 (Fig. 6(a)) of the heat-shrinkable tube 40 being larger than the outer diameter D1 of the cushioning material 20. Therefore, the extrapolation of the heat-shrinkable tube 40 with respect to the cushioning material 20 can be easily performed. Further, in the process of integrating the rubber layer (heat-shrinkable tube 40) with the cushioning material 20 (tube contraction process), it is not necessary to vulcanize the rubber layer (heat-shrinkable tube 40). In addition, the interference performance of the bollard 10 is mainly exhibited by the cushioning material 20 and the rubber layer (heat-shrinkable tube 40). Among these, the cushioning material 20 that occupies a large volume is formed of a foamed resin that does not require vulcanization. Therefore, it is possible to efficiently manufacture the bollard 10.

[0040] 1.3 Details of Each Part of the Bollard of the First Embodiment Subsequently, details of each part of the bollard of the first embodiment will be described.

[0041] (1) Support column The support column 30 is a member that functions as the core material of the bollard 10. Therefore, the support column 30 is formed of a material having rigidity such that it does not easily bend even when a vehicle or a person collides with it. Examples of such materials include metal and concrete. In the bollard of the first embodiment, the support column 30 is formed of metal. The shape of the support column 30 can adopt a quadrangular prism-shaped polygonal prism, but is usually cylindrical. In the bollard of the first embodiment, a pipe having a hollow cylindrical shape (cylindrical shape) is used as the support column 30.

[0042] The length of the support column 30 is appropriately determined according to the use of the bollard 10 and the like, and is not particularly limited. However, if the support column 30 is too short, it becomes difficult to ensure the height of the bollard 10. For this reason, the length of the support column 30 is preferably 50 cm or more. More preferably, the length of the support column 30 is 60 cm or more, and even more preferably 70 cm or more. However, if the support column 30 is made too long, the bollard 10 cannot be kept at an appropriate height. For this reason, the length of the support column 30 is usually 200 cm or less. Preferably, the length of the support column 30 is 150 cm or less. In the bollard 10 of the first embodiment, the length of the support column 30 is set to 100 cm.

[0043] The outer diameter of the support column 30 is also not particularly limited. However, if the outer diameter of the support column 30 is too small, it becomes difficult to ensure the strength of the bollard 10. For this reason, the outer diameter of the support column 30 is preferably 50 mm or more. More preferably, the outer diameter of the support column 30 is 60 mm or more, and even more preferably 70 mm or more. However, if the outer diameter of the support column 30 is made too large, it becomes necessary to increase the cushioning material 20 and the like, and the bollard 10 becomes too thick. For this reason, the outer diameter of the support column 30 is usually up to 150 - 200 mm. In the bollard 10 of the first embodiment, the outer diameter of the support column 30 is set to 100 mm.

[0044] (2) Cushioning material The cushioning material 20 is for absorbing the impact when a vehicle, a person, or the like collides with the bollard 10. This cushioning material 20 is formed of a foamed resin. Specifically, the cushioning material 20 can be formed of polypropylene (PP) foam, polyethylene (PE) foam, polystyrene (PS) foam, polyurethane (PU) foam, ethylene vinyl acetate copolymer (EVA) cross-linked foam, or the like. In the bollard 10 of the first embodiment, the cushioning material 20 is formed of polypropylene (PP) foam.

[0045] The cushioning material 20 is configured to be able to cover the outer peripheral portion of the support column 30. In the bollard 10 of the first embodiment, the cushioning material 20 is formed in a cylindrical shape. By inserting the support column 30 into the through hole provided in the cushioning material 20 (the through hole provided in the length direction of the cushioning material 20), the outer peripheral portion of the support column 30 is covered with the cushioning material 20. A cut (a cut along the length direction of the cushioning material 20) can also be formed in the peripheral wall portion of the cushioning material 20. Thereby, when inserting the support column 30 into the cushioning material 20, it becomes possible to expand the cushioning material 20 in the radial direction and easily insert the support column 30. The cut after inserting the support column 30 may be adhered with an adhesive or the like. Incidentally, the cushioning material 20 does not necessarily need to be formed of a single member, and it is also possible to be formed of a plurality of members. For example, the cushioning material 20 can be configured to be divisible into two half-pipe-shaped members (divided members). Thereby, each divided member is arranged on one side and the other side in the radial direction of the support column 30, the support column 30 is sandwiched between these divided members, and by fixing these divided members to each other, the outer peripheral portion of the support column 30 can be covered with the cushioning material 20. As the fixing method between the divided members, fitting, fastening, adhesion, etc. can be adopted.

[0046] The cushioning material 20 is set to a length that can cover the upper section of the support column 30. The portion (upper portion) of the bollard 10 covered by the cushioning material 20 becomes the portion protruding upward from the construction surface. On the other hand, the portion (lower portion) of the bollard 10 not covered by the cushioning material 20 becomes the portion buried below the construction surface. For this reason, the length L1 (Fig. 5) of the cushioning material 20 is appropriately determined according to the length L2 (Fig. 5) of the support column 30. The length L1 of the cushioning material 20 is preferably 0.5 times or more the length L2 of the support column 30, and more preferably 0.6 times or more. Also, the length L1 of the cushioning material 20 is preferably 0.9 times or less the length L2 of the support column 30, and more preferably 0.8 times or less. In the bollard 10 of the first embodiment, the length L1 of the cushioning material 20 is 0.75 times the length L2 of the support column 30. The inner diameter of the cushioning material 20 is set to be the same as or slightly larger than the outer diameter D0 (Fig. 6(a)) of the support column 30.

[0047] (3) Heat-shrinkable tube The heat-shrinkable tube 40 is for protecting the surface of the cushioning material 20. The heat-shrinkable tube 40 is formed of a rubber-based heat-shrinkable material. Specifically, the heat-shrinkable tube 40 is formed of a material in which a special polymer is blended with a rubber-based material. Examples of the rubber-based material used for the heat-shrinkable tube 40 include synthetic rubbers such as ethylene propylene rubber (EPM), styrene butadiene rubber (SBR), and chloroprene rubber (CR), as well as natural rubber. Examples of the polymer blended with these rubber-based materials include polyolefin-based polymers. When the heat-shrinkable tube 40 is heated, the molecular chains of the above polymer contract, causing the heat-shrinkable tube 40 to contract. The shrinkage ratio of a general heat-shrinkable material is about 1 / 2 to 1 / 4, but there are also high-shrinkage heat-shrinkable materials with a shrinkage ratio exceeding 1 / 6 (becoming smaller than 1 / 6 times the original dimension).

[0048] As described above, since the heat-shrinkable tube 40 is for protecting the cushioning material 20, the heat-shrinkable tube 40 is sized to be able to cover substantially the entire outer peripheral surface of the cushioning material 20. For example, the heat-shrinkable tube 40 is made to have the same length as or longer than the cushioning material 20. In other words, the ratio L3 / L1 of the length L3 (FIG. 5) of the heat-shrinkable tube 40 to the length L1 (FIG. 5) of the cushioning material 20 is usually set to 1 or more. Thereby, it becomes possible to surely cover the entire cushioning material 20 with the heat-shrinkable tube 40. The ratio L3 / L1 is preferably 1.05 or more, and more preferably 1.1 or more. The extra portions (portions (a) and (b) in FIG. 7) of the heat-shrinkable tube 40 are cut after the tube shrinkage process (in the upper tube cutting process and the lower tube cutting process). The upper limit of the ratio L3 / L1 is not particularly limited, but if the ratio L3 / L1 is too large, the portion to be cut becomes large and the yield of the heat-shrinkable tube 40 deteriorates. For this reason, the ratio L3 / L1 is usually set to 1.5 or less.

[0049] (4) Coating tape The coating tape 54 is for hiding the upper edge of the heat-shrinkable tube 40 and the like. This is because when performing the above-described upper tube cutting process, the cutting line of the heat-shrinkable tube 40 may be distorted. If this distorted cutting line is visible, the appearance of the bollard 10 may be deteriorated. By hiding this with the coating tape 54, the appearance of the bollard 10 can be improved. For the same reason, the lower edge of the heat-shrinkable tube 40 can also be covered with the coating tape 54. Examples of the material of the coating tape 54 include polyethylene (PE) and polyvinyl chloride (PVC). An adhesive layer 55 coated with an adhesive is provided on the inner surface of the coating tape 54. A reflective layer made of a retroreflective material can also be provided on the outer surface of the coating tape 54. Thereby, the headlight of a vehicle or the like can be reflected by the coating tape 54, and the visibility of the bollard 10 at night can be enhanced.

[0050] (5) Waterproof material The water stop material 60 is for covering the lower end portion of the cushion material 20. By means of this water stop material 60, it is possible to prevent rainwater or the like from seeping into the inside of the cushion material 20 from the lower end portion of the cushion material 20. Examples of the material of the water stop material 60 include rubber and sealing materials. This water stop material 60 is provided in an annular shape so as to completely cover the lower end surface of the cushion material 20. In the bollard 10 of the first embodiment, as the water stop material 60, an annular member made of rubber (rubber ring) is adopted. The outer diameter of the water stop material 60 (rubber ring) is usually set to be substantially equal to the outer diameter of the cushion material 20.

[0051] (6) Cap The cap 50 is for covering the upper portion of the cushion material 20 and the support column 30. By means of this cap 50, it is possible to prevent rainwater or the like from seeping into the inside of the cushion material 20 and the support column 30 from the upper end surface of the cushion material 20. In the bollard 10 of the first embodiment, as shown in FIG. 2, the cap 50 includes a small-diameter portion 51 and a large-diameter portion 52. The small-diameter portion 51 is a portion for inserting from the upper end of the support column 30 into the inside of the support column 30. The large-diameter portion 52 has a diameter larger than that of the small-diameter portion 51. The diameter of the large-diameter portion 52 is set to be the same as or slightly larger than the outer diameter D1 (FIG. 6(a)) of the cushion material 20. The cap 50 is attached to the support column 30 in a state where the lower end surface of the large-diameter portion 52 is in close contact with the upper end surface of the cushion material 20 (a state where no gap is generated between the upper end surface of the cushion material 20 and the lower end surface of the cap 50). The cap 50 can be formed of resin, metal, or the like, but is preferably formed of rubber. Examples of the rubber include natural rubber in addition to synthetic rubbers such as nitrile rubber, silicone rubber, and urethane rubber. In the bollard 10 of the first embodiment, the cap 50 is formed of nitrile rubber.

[0052] 2. Bollard of the Second Embodiment Next, the bollard of the second embodiment will be described. FIG. 8 is a cross-sectional perspective view showing the bollard 10 of the second embodiment cut along a plane including the center line L. Regarding the bollard 10 of the second embodiment, mainly, the description will be focused on the configuration different from that of the bollard 10 of the first embodiment. For the configuration not mentioned in the bollard 10 of the second embodiment, the same configuration as that described for the bollard 10 of the first embodiment can be adopted.

[0053] In the bollard 10 of the first embodiment described above, as shown in FIG. 2, the cap 50 was formed only of the small-diameter portion 51 and the enlarged-diameter portion 52. Also, the upper end of the heat-shrinkable tube 40 was annularly covered with the covering tape 54. On the other hand, in the bollard 10 of the second embodiment, as shown in FIG. 8, the cap 50 includes, in addition to the small-diameter portion 51 and the enlarged-diameter portion 52, a hanging portion 53 that hangs down from the outer edge of the enlarged-diameter portion 52. This hanging portion 53 is provided annularly along the upper edge of the heat-shrinkable tube 40, and the upper edge of the heat-shrinkable tube 40 is covered by this hanging portion 53. That is, the bollard 10 of the second embodiment can hide the upper cutting line of the heat-shrinkable tube 40 without using the covering tape 54. The bollard 10 of the second embodiment can be manufactured with fewer steps than the bollard 10 of the first embodiment to the extent that the above-described tape attachment step can be omitted.

[0054] 3. Bollard of the Third Embodiment Next, the bollard of the third embodiment will be described. FIG. 9 is a cross-sectional perspective view showing the bollard 10 of the third embodiment cut along a plane including the center line L. FIG. 10 is a view showing the state of manufacturing the bollard of the third embodiment, and is a cross-sectional perspective view showing the state after performing a jig installation step described later, cut along a plane including the center line L. Regarding the bollard 10 of the third embodiment, mainly, the description will be focused on the configuration different from that of the bollard 10 of the first embodiment. For the configuration not mentioned in the bollard 10 of the third embodiment, the same configuration as that described for the bollard 10 of the first embodiment can be adopted.

[0055] In the bollard 10 of the first embodiment described above, as shown in FIG. 2, the heat-shrinkable tube 40 was structured not to cover the outer peripheral portion of the cap 50. On the other hand, in the bollard 10 of the third embodiment, as shown in FIG. 9, the heat-shrinkable tube 40 is structured to cover the outer peripheral portion of the cap 50. Thereby, the boundary portion between the cap 50 and the cushion material 20 can be covered with the heat-shrinkable tube 40, preventing rainwater and the like from seeping into the cushion material 20 and the inside of the support column 30 from that boundary portion.

[0056] This bollard 10 of the third embodiment can be manufactured by performing a tube shrinkage process after performing a cap mounting process. However, in this case, it is difficult for the upper edge positions of the heat-shrinkable tube 40 with respect to the cap 50 to be aligned, and there is a risk of variation among products. On the other hand, if the upper edge of the heat-shrinkable tube 40 is cut and aligned while the cap 50 is mounted, there is a risk of damaging the cap 50. In this regard, as shown in FIG. 10, after performing a process of mounting a jig 70 instead of the cap 50 (jig installation process), a tube shrinkage process is performed. Further, after performing a process of cutting the upper edge of the heat-shrinkable tube 40 to align the upper edges of the heat-shrinkable tube 40 (tube upper side adjustment process) and a process of removing the jig 70 (jig removal process), a process of mounting the cap 50 (cap mounting process) is performed, so that the upper edge of the heat-shrinkable tube 40 can be cut and aligned without damaging the cap 50.

[0057] As described above, since the jig 70 supports the heat shrinkable tube 40 from the inside until the cap 50 is attached, the outer diameter of the jig 70 is set equal to the outer diameter D3 (Fig. 9) of the enlarged diameter portion 52 of the cap 50. Further, since the jig 70 is also in a state of being attached when the upper edge of the heat shrinkable tube 40 is cut, it is formed of a material that is not easily damaged, such as metal. An annular guide groove or the like for guiding the blade of a cutter used for cutting the heat shrinkable tube 40 can also be formed on the outer peripheral portion of the jig 70. Furthermore, the jig 70 is temporarily attached and removed when the cap attachment process is performed. Therefore, it is preferable to provide the jig 70 with a structure that serves as a clue for removing it. In this regard, in the bollard 10 of the third embodiment, a through hole 71 that penetrates the central portion of the jig 70 in the vertical direction is provided. Thereby, the jig 70 can be easily removed by inserting a tool, a finger, or the like into the through hole 71.

[0058] 4. Bollard of the Fourth Embodiment Subsequently, the bollard of the fourth embodiment will be described. Fig. 11 is a cross-sectional perspective view showing the bollard 10 of the fourth embodiment cut along a plane including the center line L. The bollard 10 of the fourth embodiment will be mainly described focusing on the configuration different from that of the bollard 10 of the first embodiment. For the configuration not mentioned in the bollard 10 of the fourth embodiment, the same configuration as that described for the bollard 10 of the first embodiment can be adopted.

[0059] In the bollard 10 of the first embodiment described above, as shown in FIG. 2, the heat shrinkable tube 40 covered only the outer peripheral surface of the cushioning material 20. That is, the lower end surface of the cushioning material 20 and the outer peripheral surface of the support column 30 (the outer peripheral surface of the portion protruding downward from the cushioning material 20; the same shall apply hereinafter) were not covered by the heat shrinkable tube 40. On the other hand, in the bollard 10 of the fourth embodiment, as shown in FIG. 11, the lower end surface of the cushioning material 20 and the outer peripheral surface of the support column 30 are also covered by the heat shrinkable tube 40. In this way, by covering the lower end surface of the cushioning material 20 with the heat shrinkable tube 40, it is possible to prevent rainwater and the like from seeping into the cushioning material 20 from the lower part of the cushioning material 20. For this reason, the water stop material 60 (FIG. 2) can be omitted. Further, by covering the outer peripheral surface of the support column 30 with the heat shrinkable tube, not only can the support column 30 be protected from corrosion (rust, etc.) and dirt, but also the rigidity of the support column 30 can be increased.

[0060] For the bollard 10 of this fourth embodiment, as the heat shrinkable tube 40, one that is longer than the support column 30 (the length L3 (FIG. 5) is longer than the length L2 (FIG. 5)) is used. When performing the tube external insertion process, the entire section of the support column 30 is covered with the heat shrinkable tube 40, and the heat shrinkage process is performed in this state, whereby it can be manufactured. In the subsequent tube lower side cutting process, the portion of the heat shrinkable tube 40 protruding below the lower end of the support column 30 is cut off.

[0061] 5. Bollard of the Fifth Embodiment Subsequently, the bollard of the fifth embodiment will be described. FIG. 12 is a cross-sectional view showing the bollard of the fifth embodiment cut along a plane including the center line L. Regarding the bollard 10 of the fifth embodiment, mainly, the description will be focused on the configuration different from that of the bollard 10 of the first embodiment. For the configuration not mentioned in the bollard 10 of the fifth embodiment, the same configuration as that described in the bollard 10 of the first embodiment can be adopted.

[0062] In the bollard 10 of the first embodiment described above, a cushioning material 20 that is somewhat hard while having elasticity was used. For this reason, as shown in FIG. 7, even after the heat shrinkage process, the cushioning material 70 does not deform significantly and maintains its original form (the form before the heat shrinkage process). Corners remain at the ends of the cushioning material 70. On the other hand, in the bollard 10 of the fifth embodiment, a more flexible cushioning material 20 is used. For this reason, as shown in FIG. 12, the corners at the ends of the cushioning material 20 are formed in a rounded shape. This is because in a cylindrical cushioning material 20, the end portion in the length direction is more likely to deform than the middle portion in the length direction. In other words, the resistance to radial tightening is smaller at the end portion in the length direction than at the middle portion in the length direction. For this reason, when the entire outer peripheral surface of the cushioning material 20 is tightened with the same force by the heat shrink tube 40, the diameter at the end portion in the length direction becomes smaller than the diameter at the middle portion in the length direction. In the bollard 10 of the fifth embodiment, the form of the cap 50 is also changed.

[0063] 6. Bollard of the Sixth Embodiment Finally, the bollard of the sixth embodiment will be described. FIG. 13 is a broken perspective view showing the bollard 10 of the sixth embodiment cut along a plane including the center line L. Regarding the bollard 10 of the sixth embodiment, mainly, the description will be focused on the configurations different from those of the bollard 10 of the first embodiment. For the configurations not mentioned in the bollard 10 of the sixth embodiment, the same configurations as those described for the bollard 10 of the first embodiment can be adopted.

[0064] As shown in FIG. 2, the bollard 10 of the first embodiment described above was columnar and extended in the vertical direction. In contrast, as shown in FIG. 13, the bollard 10 of the sixth embodiment is in an arch shape. Specifically, the support column 30 is formed in an inverted "U" shape composed of a pair of vertical support column portions 31 and a horizontal support column portion 32 that connects the upper portions of the vertical support column portions 31. The cushion material 20 and the heat shrinkable tube 40 also have a shape (inverted "U" shape) following the support column 30. If the cushion material 30 is composed of a plurality of divided members, the cushion material 30 can be attached to the support column 30 that forms such an inverted "U" shape. For example, if the cushion material 30 is composed of a half-pipe-shaped divided member that forms the front side thereof and a herb-pipe-shaped divided member that forms the rear side thereof, the pair of divided members can be arranged in front of and behind the support column 30, and the support column 30 can be sandwiched between the pair of divided members, thereby attaching the cushion material 30.

Explanation of Signs

[0065] 10 Bollard 20 Cushion material 30 Support column 31 Vertical support column portion 32 Horizontal support column portion 31 Outer peripheral portion of the support column 40 Heat shrinkable tube 50 Cap 51 Small diameter portion 52 Enlarged diameter portion 53 Dependent portion 54 Covering tape 55 Adhesive layer coated with adhesive 60 Waterstop material 70 Fixture 71 Through hole

Claims

1. A cushion material coating step of covering the outer peripheral portion of the column with a cushion material made of foamed resin, and Outer diameter D of the cushioning material １ Inner diameter D larger than ２ A tube insertion step of externally inserting a rubber-based heat-shrinkable tube having an inner diameter D larger than the outer diameter D of the cushioning material into the cushioning material, A tube shrinkage step of heating and shrinking a heat shrinkable tube and bringing the inner peripheral surface of the heat shrinkable tube into close contact with the outer peripheral surface of the cushion material A method for manufacturing a bollard, characterized by passing through these steps.

2. A cushion material coating step of covering the outer peripheral portion of the column with a cushion material made of foamed rubber, and The outer diameter D of the cushioning material １ and an inner diameter D larger than that ２ A tube insertion step of inserting a rubber-based heat-shrinkable tube having the above into the cushioning material A tube shrinkage step of heating and shrinking a heat shrinkable tube and bringing the inner peripheral surface of the heat shrinkable tube into close contact with the outer peripheral surface of the cushion material A method for manufacturing a bollard, characterized by passing through these steps.

3. The outer diameter D of the cushioning material １ The inner diameter D of the heat-shrinkable tube before shrinkage with respect to ２ The ratio D ２ / D １ is 1.05 to 2, and the method for manufacturing a bollard according to claim 1 or 2

4. When performing the tube insertion step, the heat shrinkable tube is also arranged in a range protruding upward from the upper end portion of the cushion material, and After performing the tube shrinkage step, A tube upper side cutting step of cutting a portion of the heat shrinkable tube protruding upward from the upper end portion of the cushion material, and A cap mounting step of mounting a cap on the upper end portion of the cushion material The method for manufacturing a bollard according to claim 3, which performs these steps.

5. After performing the large-diameter cap mounting step, a tape sticking step of annularly sticking a covering tape along the upper edge of the heat shrinkable tube is performed. The method for manufacturing a bollard according to claim 4.

6. When performing the tube insertion step, the heat shrinkable tube is also arranged in a range protruding upward from the upper end portion of the cushion material, and Before performing the tube shrinkage step, a jig installation step of installing a jig having the same outer diameter as the cushion material on the upper end portion of the cushion material is performed, After performing the tube shrinkage step, A jig removal step of removing the jig from the upper end portion of the cushion material, and A cap mounting step of mounting a cap on the upper end portion of the cushion material The method for manufacturing a bollard according to claim 3, which performs these steps.

7. When performing the tube insertion step, the heat shrinkable tube is also arranged in a range protruding downward from the lower end portion of the cushion material, and Before performing the tube shrinkage step, a water stop material installation step of covering the lower end surface of the cushion material with a water stop material is performed, After performing the tube shrinkage step, a tube lower side cutting step of cutting a portion of the heat shrinkable tube protruding downward from the lower side of the water stop material is performed. The method for manufacturing a bollard according to claim 3.

8. When performing the tube insertion step, the heat shrinkable tube is also arranged in a range protruding downward from the lower end portion of the cushion material and reaching the lower end portion of the column, and By performing the tube shrinkage process, a portion protruding downward from the lower end of the cushioning material in the heat shrinkable tube is brought into close contact with the outer peripheral portion of the support column. The method for manufacturing a bollard according to claim 3.

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